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Q.

The intensity variation in the interference pattern obtain with the help of two coherent sources is 5% of the average intensity. Find out the ratio of intensities of two sources.

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a

16811

b

17001

c

23

d

43

answer is A.

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Detailed Solution

I1+I22I1−I22=(1.05)Im…...(1)(0.95)Im⋯…(2)⇒I1+I2I1−I2=1.050.951/2=1.05⇒x+1x−1=1.05x=I1I2On solvingx=16811
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